Questions tagged [data-transmission]

Questions regarding transfer of data from spacecraft and probes

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13
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2answers
4k views

How to calculate data rate of Voyager 1?

I've read the following passage in the answer to the Quora question How can Voyager send a signal strong enough for us to receive, in spite of its enormous distance from us? And how can it have the ...
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6answers
917 views

Hijacked space data, notable instances of recovering images or other goodies from someone else's space mission?

These are images taken by a Chinese cubesat in lunar orbit, taken again by a Dutch radio telescope. The original of this GIF was tweeted here and I've reconstructed it because I don't know how to ...
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1answer
482 views

What exactly is the interaction that blocked Juno's data downlink near solar conjunction?

According to Space.com's article Juno Phones Home: Jupiter Probe Reconnects with Earth After 8th Flyby, Juno's recent close flyby of Jupiter and data collection happened while Jupiter was too close to ...
7
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1answer
887 views

How does Curiosity know how to point and move it's high gain antenna in real time?

The Curiosity rover has a compact X-band high-gain antenna (HGA) that allows for low data rate communication directly with Earth, but is used though for higher data rates it usually uses UHF to ...
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6answers
9k views

Why does data transfer rate decrease with distance

I read that the New Horizon's probe will send data to back to Earth at 3000 bits per second by the time it reaches Pluto. I don't understand why a spacecraft has to have a lower data tranfer rate ...
4
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1answer
283 views

Was the time of Schiaparelli's landing chosen specifically so the Giant Meter Wave Radiotelescope could listen?

The ESA blog post Listening to an Alien Landing describes the plan to monitor a UHF beacon transmitted by Schiaparelli during it's upcoming descent and landing on Mars (2016-10-19 about 14:45 UT). The ...
12
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1answer
1k views

Opportunity's last tau was 10.8; what does that mean and how is tau defined and measured?

@ahiijny added a direct link to the Sol 5110-5114 MER B Downlink Report. These are the final days that signals were received from Opportunity. The message "Tau Value is NOT a Typographical Error" ...
9
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2answers
405 views

Is it possible to extend high speed data transmission with lasers to the distance Earth to Mars?

Data transmission using an optical laser between ground station and a GEO satellite may offer very high data rates, up to 1.8 GBit/s for instance. But what about a transmission from Earth to Mars ...
4
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1answer
523 views

Have deep-space spacecraft always used some form of spread-spectrum for data downlink?

tl;dr: Question: Have deep-space spacecraft always use some form of spread-spectrum for data downlink? note: I'm looking for some insight into why, and any possible exceptions, not just a "yes" or "...
64
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1answer
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How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers?

I was listening to Sphere Packing Solved in Higher Dimensions; A Ukrainian mathematician has solved the centuries-old sphere-packing problem in dimensions eight and 24. and reading the transcript ...
22
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1answer
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What exactly turned on the light indicating Apollo 8 was starting to fall towards the Moon?

@PearsonArtPhoto's answer links to the page Apollo 8, 21 – 28 December 1968 by Hamish Lindsay at honeysucklecreek.net from where I have quoted below. Question: What exactly turned on the light ...
37
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1answer
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Why does there appear to be a 180-degree stereo microphone array outside the ISS?

I was watching a feed on the latest footage of Hurricane Matthew as seen from the ISS just now, relayed from NASA TV. Suddenly, I spotted something poking out of the ISS hull in the footage that ...
3
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1answer
112 views

Has TDRS-13 officially graduated from "TDRS school" (entered into service)?

According to Wikipedia: TDRS-M, to be renamed TDRS-13 upon entry into service, is an American communications satellite operated by NASA as part of the Tracking and Data Relay Satellite System. The ...
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0answers
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What are the general properties and specs for JWST's onboard data and image processing capabilities?

Answers and comments on What is the data storage capabilities onboard the James Webb Telescope? which reference the James Webb Space Telescope User Documentation item JWST Solid State Recorder mention ...
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2answers
355 views

What was the first use of analog to digital conversion in a satellite?

This answer to Do the Voyager probes transmit analogue or digital data? states that the Voyagers sent only digital data. This is no doubt mostly because analog data was digitized and store digitally ...
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1answer
1k views

How is data transferred from interplanetary missions?

I'm trying to find out information about the mechanics of data transmission from planetary probes: techniques, devices, methods, software. In short, How reliable data transmission is undertaken in ...
8
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1answer
2k views

Why not a "live" visual connection with Curiosity on Mars all the time?

Note: Got the idea for this question by @uhoh's question: "Has anything close to video ("live" or otherwise) been shot in space from beyond the Moon ? To have the "feeling" of a "live" connection ...
11
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1answer
5k views

Current maximum bandwidth between Mars and Earth?

What is the current maximum bandwidth between Mars and Earth (at their closest), accounting for any satellite/prober/orbiter that is either at Mars or already launched and en route? So far I've found ...
9
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1answer
972 views

Why has the Earth's motion carried it out of view of Pioneer 11's antenna?

According to The Pioneer Missions, my emphasis, The Pioneer 11 Mission ended on 30 September 1995, when the last transmission from the spacecraft was received. There have been no communications ...
8
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1answer
882 views

What evidence would be needed to determine a signal was artificial in origin?

Humanity has received some odd signals in the past. We've also sent out some signals ourselves. How could we determine that a signal we'd received was artificial in origin? Or of course inversely, ...
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5answers
7k views

Why is the James Webb Space Telescope's data storage space so small?

In a previous question, I learned that the JWST's solid state recorder (SSR) can hold at least 58.8 Gbytes of recorded science data. Which each day requires two, 4 hour downlinks with earth to empty ...
11
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1answer
993 views

What are the data storage capabilities onboard the James Webb Telescope?

If something were to happen that would cause the James Webb Telescope to be unable to downlink its data to earth, how long could it continue collecting observations before it would run out of storage ...
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2answers
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Were the Apollo broadcasts recorded locally on the LM?

I've previously asked about how the recordings from the Apollo missions were originally recorded, and then transcribed; but I forgot about the video as well! It's well known that for some of the ...
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2answers
712 views

What Voyager spacecraft hardware performed transmitted data coding in such a complicated way? Did ground decoding use “a big monster filling a rack”?

The now-famous answer to How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers? is worth stopping now here and going back and reading first. Okay welcome ...
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1answer
253 views

MarCo, Polo? Any further news, or images, or transmissions from the MarCo deep space cubesats?

Edit: Two more months have gone by since I posted this question. Can there still be no news? Nothing for the two MarCo cubesats to take photos of; not even each other? While InSight is still "...
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How will NEO Surveyor manage 82 gigabits/day of data? How will it process it, what fraction will be sent to Earth and how it compares to TESS & GAIA?

Wikipedia says says: NEO Surveyorformerly called Near-Earth Object Camera (NEOCam), then NEO Surveillance Mission, is a planned space-based infrared telescope designed to survey the Solar System for ...
3
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1answer
113 views

SpaceX live broadcast of booster & boat's eye view of the GPS III Space Vehicle 5 were both uninterrupted; have they make some upgrades to the system?

This answer to Why does the video feed always fail during Falcon 9 landings? shows that SpaceX seems to be "getting better at" or "less shy about" broadcasting continuous live ...
3
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1answer
281 views

Will Red Dragon experience a "Communications Blackout" during SRP?

In the recently proposed entry of Red Dragon into the Mars atmosphere, the supersonic retro-propulsion (or SRP, roughly: slowing down using thrusters while still moving against the atmosphere at ...
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1answer
54 views

Would a long-term network of relay satellites but worthwhile for interplanetary communication? [duplicate]

Communication rates with probes in the outer solar systems are extremely low (Voyager is ~160 bps), because of the inverse square law and the extreme distances involved. Achieving these rates ...
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1answer
127 views

Did the Voyager spacecraft use a Golay, a Reed-Solomon and/or a Hamming code for data transmission encoding for error correction? (Need clarification)

The now-famous answer to How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers? is worth stopping now here and going back and reading first. Okay welcome ...
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61 views

Were there any policies or technical reasons for powering down all Apollo ALSEPs in 1977?

I first tried to include this in the question Why were the “perfectly functioning” seismometers placed by Apollo 12, 14, 15 and 16 astronauts all shut off in 1977? but after three comments from three ...
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3answers
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Will there be live HD television from Mars with the Mars 2020 mission?

Is it known if live HD television from Mars would be possible with the Mars 2020 rover mission and if an extra channel would be possible just for relaying HD TV to make live broadcasts possible ? ...
17
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1answer
3k views

What is carrier lock and bit lock?

I'm not sure if this question belongs here or in Amateur Radio, but during the acquisition of signal from New Horizons on New Year's Day, I heard the controllers call out "carrier lock", "symbol lock",...
10
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2answers
820 views

What does a NASA employee see on their monitor when a robot lands on Mars?

I have seen that many NASA employees (see the picture) were present in the control room when InSight landed on Mars on November 26, 2018. What I did not see is what exactly those people saw on their ...
10
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2answers
770 views

Can we talk to Pioneer 6?

My question is relatively simple in the essence that it takes few words to ask, but scientifically may be a nightmare. In 2000, the Goldstone Deep Space Communications Complex sent a message to ...
9
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2answers
387 views

Do you need a "wire" on a Europa submarine to phone home?

In regards to Europa, what are the limitations regarding current data transmission technology. Say we were to have an orbiter circling Jupiter, a lander on the surface of Europa and a "swimmer" [...
17
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2answers
12k views

Do astronauts get Netflix on ISS?

I've been wondering about the internet connection on the ISS, and how it's used. We were talking in chat about astronauts personal belongings and free time, and it made me wonder about how they use ...
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1answer
1k views

Do the Voyager probes transmit analogue or digital data?

When the Voyager probes take a picture or record other data, do they digitize it on board and send a digital signal to earth (i.e. zeros and ones) or do they transmit an analogue signal (like old-...
6
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1answer
502 views

Will the Mars 2020 rover be able to record high-framerate video of its helicopter?

According to this answer, there have been no instances of video recorded from beyond lunar orbit. Mostly, this makes sense as rovers and spacecraft are served just as well with pictures and nothing ...
3
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1answer
96 views

Transmission of video and audio signals

I know this is a silly question.In july,2019 NASA's insight captured sound by wind gusts.Here is a link of video that shows the movement of robotic arms and sound of wind on mars. ...
3
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1answer
111 views

If the Voyagers' lowest playback speed is 7200 bits per second, how can it transmit to Earth at only 160 bps?

How to calculate data rate of Voyager 1? mention's Voyager's data rate is currently 160 bits per second, and clicking on a recent entry in the Voyager DSN Tracking Schedule on the Voyager Mission ...
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2answers
201 views

Were the previous Mars landers configured to transmit beacons or data during descent?

The ExoMars Entry, Descent and Landing Demonstrator Module (EDM) Schiaparelli was configured to broadcast a UHF beacon throughout the entry, descent and landing phases using multiple transmitters and ...
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1answer
93 views

Just how raw is the rawest signal data that the Deep Space Network routinely records for safety reasons?

When we watch videos of some Spacecraft landing there's a big screen with real-time plots of the data coming from the Deep Space Network's antennas. Presumably the information is recorded in fairly ...
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1answer
99 views

Long, low mass data transfer wire options

does anyone have any suggestions for wired communications over long distances on the Lunar surface? The maximum length would need to be around 1km. Distributors like Gore and Axon make great ...
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1answer
74 views

S-Band transceiver schematics [closed]

I'm working on a cubesat, and I want to communicate in the S-Band, arround 2.4GHz. And I'm searching for schematics of a transceiver example with arround 35 dBm of output power. If any have a .pdf, ....
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0answers
108 views

Does the TDRS user segment ever provide network functionality beyond being a "customer"?

Celestrak's NORAD Two-Line Element Sets Current Data TLE page has many pre-defined categories for quick access for groups of spacecraft that share similar characteristics. I clicked on the ...